Furnace-grate.



G. F. PIERCE.

FURNACE GRATE.

APPLICATION H11-:n 1u1.Y 14. 1913.

Patented Dec. 7, 1915.

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G. F. PIERCE.

FURNACE GRATE.

APPLICATION man JULY 14. :913.

Patented Dee. 7, 1915.

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FURNACE GRATE.

APPLICATION ma JULY 14. |913.

lPatented Dc. T, 1915.

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trimaran GEORGE F. Pinnen, or Kansas CITY, MISSOURI, AssIGNoR fro Ross. A. PIERCE, or

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Application -led July 14:, 1913.

To all ctc/tom 'it may concern Be it known that I, GEORGE F. Pinnen, a citizen of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful lmprovements in F urnace-Grates, of which the following is a specification.

My invention relates to improvements in furnace gratos, and my object is to provide a new and useful grate of this character possessing the features of advantage hereinafter pointed out and claimed.

ln order that said invention may be fully understood, reference will now be made to the accompanying drawings, in which:

Figure l is a vertical central viewfof ay furnace equipped with my grate. Fig. 2 is a plan view of the same. Fig. 3 is a detail perspective view of a sha-ker for rotating a cen tral member of the grate. section on line VH VH of Fig. 2. Fig. 5 is a detail of a shaker for rocking certain of the grate bars forming part Fig. 6 is a broken detail section on line IX of Fig. 2. y

Referring first to Fig. l, the numeral l designates a bridge-wall, 2 an ash-pit, and 3 a grate.

Just below the grate, and skirting the ash-pit walls, l provide an endless perforated pipe 5, composed of straight lengths connected by fourway unions 6. Stubs 7 are connected to said unions and project laterally, so as to be embedded in the side walls 8 (Fig. 2) thus firmly supporting the pipe 5.

By means of said unions 6, theperforated pipe 5 is connected with an underlying endless pipe 9 which is imperforate.

Referring now to Figs. 2 and fi; the cen tral portion of the grate consists of a circular member 80, centrallysupported by the conical upper end of a vertical shaft 81, which in turn is supported by a bearing 82, supported by four radial arms 83. The circular member 80 has a circular series of lugs 84. Loosely-mounted upon'the shaft 81 is ka lever 85, having an upwardly extending e linger 8G thereon which normally stands below the radial slots 84. Integral with lever 85 is an arm 87 (see Fig. To shake the circular grate, a shaker-rod (not shown) having a socket for the purpose is engaged with the arm 87, which is then twisted to raise the finger 86 into engagement with a lug 84. The shaker-rod is then moved in a specification of Letters Patent.

Fig. 4t is a crossof the gratef Patented Free. "3', ti. /SeralNa 778,924.

horizontal plane whereby the circular meinber 80 is turned until the iinger 86wstrikes a radial arm 8,3. Then the finger 8G is lowered, theshaker-.rod moved backward, and the above described operation repeated. ln this manner the circular member 80-may be completely rotated, step by step.

The larger and surrounding area of the grate is composed of lateral longitudinal members 89 and of various intermediate members 90, 91, 92. Each rockable gratebar 90 is provided with trunnions 90 which rest in grooves in stationary members 92 and 93, and the members 89 are mounted on members 93. The rockable bars 90 are provided with depending arms 95 (see Figs. 1 and t), arranged in transverse rows and pivotally-connected to reciprocative bars 96, one of which is close to the front of the furnace (see Fig. 5) in which is a horizontal slot 97 to permit the passage of an operating arm or shaker 98, secured to, or integral with said bar. By reciprocating this arm all of the movable grate members eX- cept the circular central member 80 will be simultaneously shaken. As shown on Fig. 2, the grate also comprises two longitudinal, stationary elements 99, which lill the space between the circular member 80 and the rockable grate-bars 90.

The center member 100 of the circular member 80 is substantially rectangular and is seated in a corresponding opening in the member 80, which supports it. Said rectangular member 100 is provided with recesses 101, which receive upstanding lugs 102 cast' on the supporting member 80.

It will be observed that the entire top surface of the circular member 80 and the center member 100 inclines upward from periphery to center, thus giving said member a conical shape. rFhe advantage gained by this formation is that the fuel resting upon this portion of the grate will be more fully exposed to the air and steam, thereby improving the combustion.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

l. A. furnace grate comprising a central rotatably mounted conical grate section, horizontal grate sections rockably mounted at the base of the conical grate section, means for rotating the conical section, and means for rocking the horizontal sections.

2. A furnace grate comprising a central rotatably mounted conical grate section, horizontal side grate bars and interposed horizontal grate bars, all arranged for rocking movement at the base of the conical section and surrounding the latter, means to simultaneously rock the bars, and means to rotate the conical section.

3. A furnace grate comprising a vertical shaft, a circular grate member mounted upon the shaft for rotation, a bell crank lever loosely mounted on the shaft below the grate member Jfor rotary movement in a horizontal plane and having one arm adapt- Copies of this patent may be obtained for five cents each, by addressing the ed for vertical movement by exerting a twist on the other arm of the bell crank, and a finger detachably secured on the first specified arm of the bell crank lever for establishing an operative connection between the grate member and the bell crank lever on twisting the latter.

In testimony whereof l aix my signature, in the presence of two witnesses.

GEORGE F. PIERCE.

Witnesses:

CARSON ADAMS, F. Gr. FISCHER.

Commissioner of Patents.

Washington, D.`C. 

